// Copyright 2026 Arctel.net
// SPDX-License-Identifier: Apache-2.0

package task

import (
	"Wavelet/plugins/domain/upload/filesrv"
	"Wavelet/plugins/domain/upload/models"
	"Wavelet/plugins/domain/upload/shared"

	"bytes"
	"context"
	"encoding/json"
	"image"
	"image/color"
	"image/png"
	"testing"
	"time"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func TestSystemCleanupHandler_Execute(t *testing.T) {
	_, cleanup := shared.SetupTestEnv(t)
	defer cleanup()

	ctx := context.Background()
	db := shared.GetDB(ctx)

	// 准备测试数据：创建一些上传记录
	now := time.Now()
	twoHoursAgo := now.Add(-2 * time.Hour)

	records := []*models.Upload{
		// 超过1小时且状态为 pending 的记录 —— 应被清理
		{
			UserID: 1001, FileName: "old_file_1.jpg", FilePath: "uploads/old_1.jpg",
			FileSize: 1024, MimeType: "image/jpeg", Extension: "jpg", Hash: "hash1",
			Type: "attachment", Status: models.UploadStatusPending,
			CreatedAt: twoHoursAgo,
		},
		{
			UserID: 1001, FileName: "old_file_2.png", FilePath: "uploads/old_2.png",
			FileSize: 2048, MimeType: "image/png", Extension: "png", Hash: "hash2",
			Type: "attachment", Status: models.UploadStatusPending,
			CreatedAt: twoHoursAgo,
		},
		// 状态为 used 的记录 —— 不应被清理
		{
			UserID: 1001, FileName: "used_file.jpg", FilePath: "uploads/used.jpg",
			FileSize: 512, MimeType: "image/jpeg", Extension: "jpg", Hash: "hash3",
			Type: "attachment", Status: models.UploadStatusUsed,
			CreatedAt: twoHoursAgo,
		},
		// 不到1小时的 pending 记录 —— 不应被清理
		{
			UserID: 1001, FileName: "recent_file.jpg", FilePath: "uploads/recent.jpg",
			FileSize: 256, MimeType: "image/jpeg", Extension: "jpg", Hash: "hash4",
			Type: "attachment", Status: models.UploadStatusPending,
			CreatedAt: now.Add(-10 * time.Minute),
		},
	}
	for _, r := range records {
		err := db.Create(r).Error
		require.NoError(t, err)
	}

	// 执行 handler
	handler := &SystemCleanupHandler{}
	result, err := handler.Execute(ctx, nil)

	// 验证结果
	require.NoError(t, err)
	require.NotNil(t, result)
	assert.Contains(t, result.Message, "系统垃圾清理完成")

	// 验证数据库状态：pending 且超过1小时的已被清理
	var pendingCount int64
	db.Model(&models.Upload{}).Where("status = ?", models.UploadStatusPending).Count(&pendingCount)
	assert.Equal(t, int64(1), pendingCount, "应只剩1条 pending 记录（最近的文件）")

	var usedCount int64
	db.Model(&models.Upload{}).Where("status = ?", models.UploadStatusUsed).Count(&usedCount)
	assert.Equal(t, int64(1), usedCount, "used 状态的文件不应受影响")
}

func TestSystemCleanupHandler_ExecuteNoFiles(t *testing.T) {
	_, cleanup := shared.SetupTestEnv(t)
	defer cleanup()

	ctx := context.Background()

	// 没有任何上传记录
	handler := &SystemCleanupHandler{}
	result, err := handler.Execute(ctx, nil)

	require.NoError(t, err)
	require.NotNil(t, result)
	assert.Contains(t, result.Message, "系统垃圾清理完成")
}

func TestWarmImageCacheHandlerValidatePayload(t *testing.T) {
	tests := []struct {
		name        string
		payload     []byte
		wantQuality string
		wantErr     bool
	}{
		{
			name:        "normalizes quality",
			payload:     []byte(`{"quality":" HIGH "}`),
			wantQuality: shared.ImageQualityHigh,
		},
		{
			name:    "empty payload",
			wantErr: true,
		},
		{
			name:    "invalid json",
			payload: []byte(`{`),
			wantErr: true,
		},
		{
			name:    "origin is not a compressed quality",
			payload: []byte(`{"quality":"origin"}`),
			wantErr: true,
		},
		{
			name:    "unsupported quality",
			payload: []byte(`{"quality":"maximum"}`),
			wantErr: true,
		},
	}

	handler := &WarmImageCacheHandler{}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			gotPayload, err := handler.ValidatePayload(tt.payload)
			if gotErr := err != nil; gotErr != tt.wantErr {
				t.Fatalf("ValidatePayload(%s) error = %v, want error presence = %t", tt.payload, err, tt.wantErr)
			}
			if tt.wantErr {
				return
			}

			var got WarmImageCachePayload
			if err := json.Unmarshal(gotPayload, &got); err != nil {
				t.Fatalf("json.Unmarshal(%s) returned error: %v", gotPayload, err)
			}
			if got.Quality != tt.wantQuality {
				t.Errorf("ValidatePayload(%s).Quality = %q, want %q", tt.payload, got.Quality, tt.wantQuality)
			}
		})
	}
}

func TestWarmImageCacheHandlerExecute(t *testing.T) {
	dbConn, cleanup := shared.SetupTestEnv(t)
	defer cleanup()

	ctx := context.Background()

	firstPath := "uploads/first.png"
	secondPath := "uploads/second.jpg"
	firstData := writeTaskTestPNG(t, color.RGBA{R: 255, A: 255})
	secondData := writeTaskTestPNG(t, color.RGBA{G: 255, A: 255})

	storageSvc, ok := shared.GetStorage(ctx).(*shared.MockStorageService)
	if !ok {
		t.Fatalf("shared.GetStorage(%T) returned %T, want *shared.MockStorageService", ctx, storageSvc)
	}
	storageSvc.PutRaw(firstPath, firstData)
	storageSvc.PutRaw(secondPath, secondData)

	records := []models.Upload{
		{
			ID:        4101,
			UserID:    1001,
			FileName:  "first.png",
			FilePath:  firstPath,
			FileSize:  int64(len(firstData)),
			MimeType:  "image/png",
			Extension: "png",
			Hash:      "hash1",
			Type:      "attachment",
			Status:    models.UploadStatusUsed,
		},
		{
			ID:        4102,
			UserID:    1001,
			FileName:  "second.jpg",
			FilePath:  secondPath,
			FileSize:  int64(len(secondData)),
			MimeType:  "application/octet-stream",
			Extension: "jpg",
			Hash:      "hash2",
			Type:      "attachment",
			Status:    models.UploadStatusPending,
		},
		{
			ID:        4103,
			UserID:    1001,
			FileName:  "notes.txt",
			FilePath:  "uploads/notes.txt",
			FileSize:  123,
			MimeType:  "text/plain",
			Extension: "txt",
			Hash:      "hash3",
			Type:      "attachment",
			Status:    models.UploadStatusUsed,
		},
		{
			ID:        4104,
			UserID:    1001,
			FileName:  "deleted.png",
			FilePath:  firstPath,
			FileSize:  int64(len(firstData)),
			MimeType:  "image/png",
			Extension: "png",
			Hash:      "hash4",
			Type:      "attachment",
			Status:    models.UploadStatusDeleted,
		},
	}

	for i := range records {
		if err := dbConn.Create(&records[i]).Error; err != nil {
			t.Fatalf("failed to create upload %d: %v", records[i].ID, err)
		}
	}

	handler := &WarmImageCacheHandler{}
	payload := []byte(`{"quality":"low"}`)

	result, err := handler.Execute(ctx, payload)
	if err != nil {
		t.Fatalf("Execute(%s) returned error: %v", payload, err)
	}
	if result == nil {
		t.Fatal("Execute() result = nil, want non-nil")
	}
	if result.Message != "图片缓存预热完成，共处理 2 张，生成 2 张，命中 0 张，失败 0 张" {
		t.Errorf("Execute() message = %q, want generated summary", result.Message)
	}

	for i := range records[:2] {
		key := filesrv.ImageCompressionCacheKey(&records[i], shared.ImageQualityLow)
		got, hit, err := filesrv.EnsureCompressedImageCache(context.Background(), &records[i], shared.ImageQualityLow)
		if err != nil {
			t.Errorf("EnsureCompressedImageCache(%q) returned error: %v", key, err)
			continue
		}
		if !hit {
			t.Errorf("expected cache hit for %q", key)
		}
		if len(got) == 0 {
			t.Errorf("EnsureCompressedImageCache(%q) returned empty WebP data", key)
		}
	}

	secondResult, err := handler.Execute(ctx, payload)
	if err != nil {
		t.Fatalf("second Execute(%s) returned error: %v", payload, err)
	}
	if secondResult.Message != "图片缓存预热完成，共处理 2 张，生成 0 张，命中 2 张，失败 0 张" {
		t.Errorf("second Execute() message = %q, want cache-hit summary", secondResult.Message)
	}

}

func writeTaskTestPNG(t *testing.T, fill color.RGBA) []byte {
	t.Helper()

	img := image.NewRGBA(image.Rect(0, 0, 2, 2))
	for y := 0; y < 2; y++ {
		for x := 0; x < 2; x++ {
			img.Set(x, y, fill)
		}
	}

	var buf bytes.Buffer
	if err := png.Encode(&buf, img); err != nil {
		t.Fatalf("png.Encode() returned error: %v", err)
	}

	return buf.Bytes()
}